add switcher to switch between denomination in Sats and BTC

[hank-milliken]

• [x] Both BTC input and rates below the fiat currencties are changed by this switcher between BTC and Sats
• [ ] Sats are default!
• [x] Sats have thousand separated by a space (both for inputs and rates). Example 1 234 567.891.
  • [ ] Separator is U+2009, "thin space"
• [ ] Precision for both input and rate is to 1/1000 satas, Example: 1.001
• [x] Scientific format does not apply on "Sats mode" it it always just sats to 3 decimal places example: 1 234 567.891.